1 /* 2 * QEMU System Emulator 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 27 #include "net/net.h" 28 #include "clients.h" 29 #include "hub.h" 30 #include "hw/qdev-properties.h" 31 #include "net/slirp.h" 32 #include "net/eth.h" 33 #include "util.h" 34 35 #include "monitor/monitor.h" 36 #include "qemu/help_option.h" 37 #include "qapi/qapi-commands-net.h" 38 #include "qapi/qapi-visit-net.h" 39 #include "qapi/qmp/qdict.h" 40 #include "qapi/qmp/qerror.h" 41 #include "qemu/error-report.h" 42 #include "qemu/sockets.h" 43 #include "qemu/cutils.h" 44 #include "qemu/config-file.h" 45 #include "qemu/ctype.h" 46 #include "qemu/id.h" 47 #include "qemu/iov.h" 48 #include "qemu/qemu-print.h" 49 #include "qemu/main-loop.h" 50 #include "qemu/option.h" 51 #include "qapi/error.h" 52 #include "qapi/opts-visitor.h" 53 #include "sysemu/runstate.h" 54 #include "net/colo-compare.h" 55 #include "net/filter.h" 56 #include "qapi/string-output-visitor.h" 57 58 /* Net bridge is currently not supported for W32. */ 59 #if !defined(_WIN32) 60 # define CONFIG_NET_BRIDGE 61 #endif 62 63 static VMChangeStateEntry *net_change_state_entry; 64 static QTAILQ_HEAD(, NetClientState) net_clients; 65 66 /***********************************************************/ 67 /* network device redirectors */ 68 69 int parse_host_port(struct sockaddr_in *saddr, const char *str, 70 Error **errp) 71 { 72 gchar **substrings; 73 struct hostent *he; 74 const char *addr, *p, *r; 75 int port, ret = 0; 76 77 memset(saddr, 0, sizeof(*saddr)); 78 79 substrings = g_strsplit(str, ":", 2); 80 if (!substrings || !substrings[0] || !substrings[1]) { 81 error_setg(errp, "host address '%s' doesn't contain ':' " 82 "separating host from port", str); 83 ret = -1; 84 goto out; 85 } 86 87 addr = substrings[0]; 88 p = substrings[1]; 89 90 saddr->sin_family = AF_INET; 91 if (addr[0] == '\0') { 92 saddr->sin_addr.s_addr = 0; 93 } else { 94 if (qemu_isdigit(addr[0])) { 95 if (!inet_aton(addr, &saddr->sin_addr)) { 96 error_setg(errp, "host address '%s' is not a valid " 97 "IPv4 address", addr); 98 ret = -1; 99 goto out; 100 } 101 } else { 102 he = gethostbyname(addr); 103 if (he == NULL) { 104 error_setg(errp, "can't resolve host address '%s'", addr); 105 ret = -1; 106 goto out; 107 } 108 saddr->sin_addr = *(struct in_addr *)he->h_addr; 109 } 110 } 111 port = strtol(p, (char **)&r, 0); 112 if (r == p) { 113 error_setg(errp, "port number '%s' is invalid", p); 114 ret = -1; 115 goto out; 116 } 117 saddr->sin_port = htons(port); 118 119 out: 120 g_strfreev(substrings); 121 return ret; 122 } 123 124 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 125 { 126 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 127 macaddr[0], macaddr[1], macaddr[2], 128 macaddr[3], macaddr[4], macaddr[5]); 129 } 130 131 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 132 { 133 snprintf(nc->info_str, sizeof(nc->info_str), 134 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 135 nc->model, 136 macaddr[0], macaddr[1], macaddr[2], 137 macaddr[3], macaddr[4], macaddr[5]); 138 } 139 140 static int mac_table[256] = {0}; 141 142 static void qemu_macaddr_set_used(MACAddr *macaddr) 143 { 144 int index; 145 146 for (index = 0x56; index < 0xFF; index++) { 147 if (macaddr->a[5] == index) { 148 mac_table[index]++; 149 } 150 } 151 } 152 153 static void qemu_macaddr_set_free(MACAddr *macaddr) 154 { 155 int index; 156 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 157 158 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 159 return; 160 } 161 for (index = 0x56; index < 0xFF; index++) { 162 if (macaddr->a[5] == index) { 163 mac_table[index]--; 164 } 165 } 166 } 167 168 static int qemu_macaddr_get_free(void) 169 { 170 int index; 171 172 for (index = 0x56; index < 0xFF; index++) { 173 if (mac_table[index] == 0) { 174 return index; 175 } 176 } 177 178 return -1; 179 } 180 181 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 182 { 183 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 184 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 185 186 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 187 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 188 return; 189 } else { 190 qemu_macaddr_set_used(macaddr); 191 return; 192 } 193 } 194 195 macaddr->a[0] = 0x52; 196 macaddr->a[1] = 0x54; 197 macaddr->a[2] = 0x00; 198 macaddr->a[3] = 0x12; 199 macaddr->a[4] = 0x34; 200 macaddr->a[5] = qemu_macaddr_get_free(); 201 qemu_macaddr_set_used(macaddr); 202 } 203 204 /** 205 * Generate a name for net client 206 * 207 * Only net clients created with the legacy -net option and NICs need this. 208 */ 209 static char *assign_name(NetClientState *nc1, const char *model) 210 { 211 NetClientState *nc; 212 int id = 0; 213 214 QTAILQ_FOREACH(nc, &net_clients, next) { 215 if (nc == nc1) { 216 continue; 217 } 218 if (strcmp(nc->model, model) == 0) { 219 id++; 220 } 221 } 222 223 return g_strdup_printf("%s.%d", model, id); 224 } 225 226 static void qemu_net_client_destructor(NetClientState *nc) 227 { 228 g_free(nc); 229 } 230 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 231 unsigned flags, 232 const struct iovec *iov, 233 int iovcnt, 234 void *opaque); 235 236 static void qemu_net_client_setup(NetClientState *nc, 237 NetClientInfo *info, 238 NetClientState *peer, 239 const char *model, 240 const char *name, 241 NetClientDestructor *destructor, 242 bool is_datapath) 243 { 244 nc->info = info; 245 nc->model = g_strdup(model); 246 if (name) { 247 nc->name = g_strdup(name); 248 } else { 249 nc->name = assign_name(nc, model); 250 } 251 252 if (peer) { 253 assert(!peer->peer); 254 nc->peer = peer; 255 peer->peer = nc; 256 } 257 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 258 259 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 260 nc->destructor = destructor; 261 nc->is_datapath = is_datapath; 262 QTAILQ_INIT(&nc->filters); 263 } 264 265 NetClientState *qemu_new_net_client(NetClientInfo *info, 266 NetClientState *peer, 267 const char *model, 268 const char *name) 269 { 270 NetClientState *nc; 271 272 assert(info->size >= sizeof(NetClientState)); 273 274 nc = g_malloc0(info->size); 275 qemu_net_client_setup(nc, info, peer, model, name, 276 qemu_net_client_destructor, true); 277 278 return nc; 279 } 280 281 NetClientState *qemu_new_net_control_client(NetClientInfo *info, 282 NetClientState *peer, 283 const char *model, 284 const char *name) 285 { 286 NetClientState *nc; 287 288 assert(info->size >= sizeof(NetClientState)); 289 290 nc = g_malloc0(info->size); 291 qemu_net_client_setup(nc, info, peer, model, name, 292 qemu_net_client_destructor, false); 293 294 return nc; 295 } 296 297 NICState *qemu_new_nic(NetClientInfo *info, 298 NICConf *conf, 299 const char *model, 300 const char *name, 301 void *opaque) 302 { 303 NetClientState **peers = conf->peers.ncs; 304 NICState *nic; 305 int i, queues = MAX(1, conf->peers.queues); 306 307 assert(info->type == NET_CLIENT_DRIVER_NIC); 308 assert(info->size >= sizeof(NICState)); 309 310 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 311 nic->ncs = (void *)nic + info->size; 312 nic->conf = conf; 313 nic->opaque = opaque; 314 315 for (i = 0; i < queues; i++) { 316 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 317 NULL, true); 318 nic->ncs[i].queue_index = i; 319 } 320 321 return nic; 322 } 323 324 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 325 { 326 return nic->ncs + queue_index; 327 } 328 329 NetClientState *qemu_get_queue(NICState *nic) 330 { 331 return qemu_get_subqueue(nic, 0); 332 } 333 334 NICState *qemu_get_nic(NetClientState *nc) 335 { 336 NetClientState *nc0 = nc - nc->queue_index; 337 338 return (NICState *)((void *)nc0 - nc->info->size); 339 } 340 341 void *qemu_get_nic_opaque(NetClientState *nc) 342 { 343 NICState *nic = qemu_get_nic(nc); 344 345 return nic->opaque; 346 } 347 348 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 349 { 350 assert(nc != NULL); 351 NetClientState *ncs = nc + queue_index; 352 return ncs->peer; 353 } 354 355 static void qemu_cleanup_net_client(NetClientState *nc) 356 { 357 QTAILQ_REMOVE(&net_clients, nc, next); 358 359 if (nc->info->cleanup) { 360 nc->info->cleanup(nc); 361 } 362 } 363 364 static void qemu_free_net_client(NetClientState *nc) 365 { 366 if (nc->incoming_queue) { 367 qemu_del_net_queue(nc->incoming_queue); 368 } 369 if (nc->peer) { 370 nc->peer->peer = NULL; 371 } 372 g_free(nc->name); 373 g_free(nc->model); 374 if (nc->destructor) { 375 nc->destructor(nc); 376 } 377 } 378 379 void qemu_del_net_client(NetClientState *nc) 380 { 381 NetClientState *ncs[MAX_QUEUE_NUM]; 382 int queues, i; 383 NetFilterState *nf, *next; 384 385 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 386 387 /* If the NetClientState belongs to a multiqueue backend, we will change all 388 * other NetClientStates also. 389 */ 390 queues = qemu_find_net_clients_except(nc->name, ncs, 391 NET_CLIENT_DRIVER_NIC, 392 MAX_QUEUE_NUM); 393 assert(queues != 0); 394 395 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 396 object_unparent(OBJECT(nf)); 397 } 398 399 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 400 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 401 NICState *nic = qemu_get_nic(nc->peer); 402 if (nic->peer_deleted) { 403 return; 404 } 405 nic->peer_deleted = true; 406 407 for (i = 0; i < queues; i++) { 408 ncs[i]->peer->link_down = true; 409 } 410 411 if (nc->peer->info->link_status_changed) { 412 nc->peer->info->link_status_changed(nc->peer); 413 } 414 415 for (i = 0; i < queues; i++) { 416 qemu_cleanup_net_client(ncs[i]); 417 } 418 419 return; 420 } 421 422 for (i = 0; i < queues; i++) { 423 qemu_cleanup_net_client(ncs[i]); 424 qemu_free_net_client(ncs[i]); 425 } 426 } 427 428 void qemu_del_nic(NICState *nic) 429 { 430 int i, queues = MAX(nic->conf->peers.queues, 1); 431 432 qemu_macaddr_set_free(&nic->conf->macaddr); 433 434 for (i = 0; i < queues; i++) { 435 NetClientState *nc = qemu_get_subqueue(nic, i); 436 /* If this is a peer NIC and peer has already been deleted, free it now. */ 437 if (nic->peer_deleted) { 438 qemu_free_net_client(nc->peer); 439 } else if (nc->peer) { 440 /* if there are RX packets pending, complete them */ 441 qemu_purge_queued_packets(nc->peer); 442 } 443 } 444 445 for (i = queues - 1; i >= 0; i--) { 446 NetClientState *nc = qemu_get_subqueue(nic, i); 447 448 qemu_cleanup_net_client(nc); 449 qemu_free_net_client(nc); 450 } 451 452 g_free(nic); 453 } 454 455 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 456 { 457 NetClientState *nc; 458 459 QTAILQ_FOREACH(nc, &net_clients, next) { 460 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 461 if (nc->queue_index == 0) { 462 func(qemu_get_nic(nc), opaque); 463 } 464 } 465 } 466 } 467 468 bool qemu_has_ufo(NetClientState *nc) 469 { 470 if (!nc || !nc->info->has_ufo) { 471 return false; 472 } 473 474 return nc->info->has_ufo(nc); 475 } 476 477 bool qemu_has_vnet_hdr(NetClientState *nc) 478 { 479 if (!nc || !nc->info->has_vnet_hdr) { 480 return false; 481 } 482 483 return nc->info->has_vnet_hdr(nc); 484 } 485 486 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 487 { 488 if (!nc || !nc->info->has_vnet_hdr_len) { 489 return false; 490 } 491 492 return nc->info->has_vnet_hdr_len(nc, len); 493 } 494 495 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 496 { 497 if (!nc || !nc->info->using_vnet_hdr) { 498 return; 499 } 500 501 nc->info->using_vnet_hdr(nc, enable); 502 } 503 504 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 505 int ecn, int ufo) 506 { 507 if (!nc || !nc->info->set_offload) { 508 return; 509 } 510 511 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 512 } 513 514 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 515 { 516 if (!nc || !nc->info->set_vnet_hdr_len) { 517 return; 518 } 519 520 nc->vnet_hdr_len = len; 521 nc->info->set_vnet_hdr_len(nc, len); 522 } 523 524 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 525 { 526 #if HOST_BIG_ENDIAN 527 if (!nc || !nc->info->set_vnet_le) { 528 return -ENOSYS; 529 } 530 531 return nc->info->set_vnet_le(nc, is_le); 532 #else 533 return 0; 534 #endif 535 } 536 537 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 538 { 539 #if HOST_BIG_ENDIAN 540 return 0; 541 #else 542 if (!nc || !nc->info->set_vnet_be) { 543 return -ENOSYS; 544 } 545 546 return nc->info->set_vnet_be(nc, is_be); 547 #endif 548 } 549 550 int qemu_can_receive_packet(NetClientState *nc) 551 { 552 if (nc->receive_disabled) { 553 return 0; 554 } else if (nc->info->can_receive && 555 !nc->info->can_receive(nc)) { 556 return 0; 557 } 558 return 1; 559 } 560 561 int qemu_can_send_packet(NetClientState *sender) 562 { 563 int vm_running = runstate_is_running(); 564 565 if (!vm_running) { 566 return 0; 567 } 568 569 if (!sender->peer) { 570 return 1; 571 } 572 573 return qemu_can_receive_packet(sender->peer); 574 } 575 576 static ssize_t filter_receive_iov(NetClientState *nc, 577 NetFilterDirection direction, 578 NetClientState *sender, 579 unsigned flags, 580 const struct iovec *iov, 581 int iovcnt, 582 NetPacketSent *sent_cb) 583 { 584 ssize_t ret = 0; 585 NetFilterState *nf = NULL; 586 587 if (direction == NET_FILTER_DIRECTION_TX) { 588 QTAILQ_FOREACH(nf, &nc->filters, next) { 589 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 590 iovcnt, sent_cb); 591 if (ret) { 592 return ret; 593 } 594 } 595 } else { 596 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 597 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 598 iovcnt, sent_cb); 599 if (ret) { 600 return ret; 601 } 602 } 603 } 604 605 return ret; 606 } 607 608 static ssize_t filter_receive(NetClientState *nc, 609 NetFilterDirection direction, 610 NetClientState *sender, 611 unsigned flags, 612 const uint8_t *data, 613 size_t size, 614 NetPacketSent *sent_cb) 615 { 616 struct iovec iov = { 617 .iov_base = (void *)data, 618 .iov_len = size 619 }; 620 621 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 622 } 623 624 void qemu_purge_queued_packets(NetClientState *nc) 625 { 626 if (!nc->peer) { 627 return; 628 } 629 630 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 631 } 632 633 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 634 { 635 nc->receive_disabled = 0; 636 637 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 638 if (net_hub_flush(nc->peer)) { 639 qemu_notify_event(); 640 } 641 } 642 if (qemu_net_queue_flush(nc->incoming_queue)) { 643 /* We emptied the queue successfully, signal to the IO thread to repoll 644 * the file descriptor (for tap, for example). 645 */ 646 qemu_notify_event(); 647 } else if (purge) { 648 /* Unable to empty the queue, purge remaining packets */ 649 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 650 } 651 } 652 653 void qemu_flush_queued_packets(NetClientState *nc) 654 { 655 qemu_flush_or_purge_queued_packets(nc, false); 656 } 657 658 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 659 unsigned flags, 660 const uint8_t *buf, int size, 661 NetPacketSent *sent_cb) 662 { 663 NetQueue *queue; 664 int ret; 665 666 #ifdef DEBUG_NET 667 printf("qemu_send_packet_async:\n"); 668 qemu_hexdump(stdout, "net", buf, size); 669 #endif 670 671 if (sender->link_down || !sender->peer) { 672 return size; 673 } 674 675 /* Let filters handle the packet first */ 676 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 677 sender, flags, buf, size, sent_cb); 678 if (ret) { 679 return ret; 680 } 681 682 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 683 sender, flags, buf, size, sent_cb); 684 if (ret) { 685 return ret; 686 } 687 688 queue = sender->peer->incoming_queue; 689 690 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 691 } 692 693 ssize_t qemu_send_packet_async(NetClientState *sender, 694 const uint8_t *buf, int size, 695 NetPacketSent *sent_cb) 696 { 697 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 698 buf, size, sent_cb); 699 } 700 701 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 702 { 703 return qemu_send_packet_async(nc, buf, size, NULL); 704 } 705 706 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size) 707 { 708 if (!qemu_can_receive_packet(nc)) { 709 return 0; 710 } 711 712 return qemu_net_queue_receive(nc->incoming_queue, buf, size); 713 } 714 715 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov, 716 int iovcnt) 717 { 718 if (!qemu_can_receive_packet(nc)) { 719 return 0; 720 } 721 722 return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt); 723 } 724 725 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 726 { 727 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 728 buf, size, NULL); 729 } 730 731 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 732 int iovcnt, unsigned flags) 733 { 734 uint8_t *buf = NULL; 735 uint8_t *buffer; 736 size_t offset; 737 ssize_t ret; 738 739 if (iovcnt == 1) { 740 buffer = iov[0].iov_base; 741 offset = iov[0].iov_len; 742 } else { 743 offset = iov_size(iov, iovcnt); 744 if (offset > NET_BUFSIZE) { 745 return -1; 746 } 747 buf = g_malloc(offset); 748 buffer = buf; 749 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 750 } 751 752 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 753 ret = nc->info->receive_raw(nc, buffer, offset); 754 } else { 755 ret = nc->info->receive(nc, buffer, offset); 756 } 757 758 g_free(buf); 759 return ret; 760 } 761 762 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 763 unsigned flags, 764 const struct iovec *iov, 765 int iovcnt, 766 void *opaque) 767 { 768 NetClientState *nc = opaque; 769 int ret; 770 771 772 if (nc->link_down) { 773 return iov_size(iov, iovcnt); 774 } 775 776 if (nc->receive_disabled) { 777 return 0; 778 } 779 780 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 781 ret = nc->info->receive_iov(nc, iov, iovcnt); 782 } else { 783 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 784 } 785 786 if (ret == 0) { 787 nc->receive_disabled = 1; 788 } 789 790 return ret; 791 } 792 793 ssize_t qemu_sendv_packet_async(NetClientState *sender, 794 const struct iovec *iov, int iovcnt, 795 NetPacketSent *sent_cb) 796 { 797 NetQueue *queue; 798 size_t size = iov_size(iov, iovcnt); 799 int ret; 800 801 if (size > NET_BUFSIZE) { 802 return size; 803 } 804 805 if (sender->link_down || !sender->peer) { 806 return size; 807 } 808 809 /* Let filters handle the packet first */ 810 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 811 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 812 if (ret) { 813 return ret; 814 } 815 816 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 817 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 818 if (ret) { 819 return ret; 820 } 821 822 queue = sender->peer->incoming_queue; 823 824 return qemu_net_queue_send_iov(queue, sender, 825 QEMU_NET_PACKET_FLAG_NONE, 826 iov, iovcnt, sent_cb); 827 } 828 829 ssize_t 830 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 831 { 832 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 833 } 834 835 NetClientState *qemu_find_netdev(const char *id) 836 { 837 NetClientState *nc; 838 839 QTAILQ_FOREACH(nc, &net_clients, next) { 840 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 841 continue; 842 if (!strcmp(nc->name, id)) { 843 return nc; 844 } 845 } 846 847 return NULL; 848 } 849 850 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 851 NetClientDriver type, int max) 852 { 853 NetClientState *nc; 854 int ret = 0; 855 856 QTAILQ_FOREACH(nc, &net_clients, next) { 857 if (nc->info->type == type) { 858 continue; 859 } 860 if (!id || !strcmp(nc->name, id)) { 861 if (ret < max) { 862 ncs[ret] = nc; 863 } 864 ret++; 865 } 866 } 867 868 return ret; 869 } 870 871 static int nic_get_free_idx(void) 872 { 873 int index; 874 875 for (index = 0; index < MAX_NICS; index++) 876 if (!nd_table[index].used) 877 return index; 878 return -1; 879 } 880 881 int qemu_show_nic_models(const char *arg, const char *const *models) 882 { 883 int i; 884 885 if (!arg || !is_help_option(arg)) { 886 return 0; 887 } 888 889 printf("Supported NIC models:\n"); 890 for (i = 0 ; models[i]; i++) { 891 printf("%s\n", models[i]); 892 } 893 return 1; 894 } 895 896 void qemu_check_nic_model(NICInfo *nd, const char *model) 897 { 898 const char *models[2]; 899 900 models[0] = model; 901 models[1] = NULL; 902 903 if (qemu_show_nic_models(nd->model, models)) 904 exit(0); 905 if (qemu_find_nic_model(nd, models, model) < 0) 906 exit(1); 907 } 908 909 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 910 const char *default_model) 911 { 912 int i; 913 914 if (!nd->model) 915 nd->model = g_strdup(default_model); 916 917 for (i = 0 ; models[i]; i++) { 918 if (strcmp(nd->model, models[i]) == 0) 919 return i; 920 } 921 922 error_report("Unsupported NIC model: %s", nd->model); 923 return -1; 924 } 925 926 static int net_init_nic(const Netdev *netdev, const char *name, 927 NetClientState *peer, Error **errp) 928 { 929 int idx; 930 NICInfo *nd; 931 const NetLegacyNicOptions *nic; 932 933 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 934 nic = &netdev->u.nic; 935 936 idx = nic_get_free_idx(); 937 if (idx == -1 || nb_nics >= MAX_NICS) { 938 error_setg(errp, "too many NICs"); 939 return -1; 940 } 941 942 nd = &nd_table[idx]; 943 944 memset(nd, 0, sizeof(*nd)); 945 946 if (nic->has_netdev) { 947 nd->netdev = qemu_find_netdev(nic->netdev); 948 if (!nd->netdev) { 949 error_setg(errp, "netdev '%s' not found", nic->netdev); 950 return -1; 951 } 952 } else { 953 assert(peer); 954 nd->netdev = peer; 955 } 956 nd->name = g_strdup(name); 957 if (nic->has_model) { 958 nd->model = g_strdup(nic->model); 959 } 960 if (nic->has_addr) { 961 nd->devaddr = g_strdup(nic->addr); 962 } 963 964 if (nic->has_macaddr && 965 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 966 error_setg(errp, "invalid syntax for ethernet address"); 967 return -1; 968 } 969 if (nic->has_macaddr && 970 is_multicast_ether_addr(nd->macaddr.a)) { 971 error_setg(errp, 972 "NIC cannot have multicast MAC address (odd 1st byte)"); 973 return -1; 974 } 975 qemu_macaddr_default_if_unset(&nd->macaddr); 976 977 if (nic->has_vectors) { 978 if (nic->vectors > 0x7ffffff) { 979 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 980 return -1; 981 } 982 nd->nvectors = nic->vectors; 983 } else { 984 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 985 } 986 987 nd->used = 1; 988 nb_nics++; 989 990 return idx; 991 } 992 993 994 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 995 const Netdev *netdev, 996 const char *name, 997 NetClientState *peer, Error **errp) = { 998 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 999 #ifdef CONFIG_SLIRP 1000 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 1001 #endif 1002 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 1003 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 1004 #ifdef CONFIG_VDE 1005 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 1006 #endif 1007 #ifdef CONFIG_NETMAP 1008 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 1009 #endif 1010 #ifdef CONFIG_NET_BRIDGE 1011 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 1012 #endif 1013 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 1014 #ifdef CONFIG_VHOST_NET_USER 1015 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 1016 #endif 1017 #ifdef CONFIG_VHOST_NET_VDPA 1018 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 1019 #endif 1020 #ifdef CONFIG_L2TPV3 1021 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1022 #endif 1023 #ifdef CONFIG_VMNET 1024 [NET_CLIENT_DRIVER_VMNET_HOST] = net_init_vmnet_host, 1025 [NET_CLIENT_DRIVER_VMNET_SHARED] = net_init_vmnet_shared, 1026 [NET_CLIENT_DRIVER_VMNET_BRIDGED] = net_init_vmnet_bridged, 1027 #endif /* CONFIG_VMNET */ 1028 }; 1029 1030 1031 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1032 { 1033 NetClientState *peer = NULL; 1034 NetClientState *nc; 1035 1036 if (is_netdev) { 1037 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1038 !net_client_init_fun[netdev->type]) { 1039 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1040 "a netdev backend type"); 1041 return -1; 1042 } 1043 } else { 1044 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1045 return 0; /* nothing to do */ 1046 } 1047 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT || 1048 !net_client_init_fun[netdev->type]) { 1049 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1050 "a net backend type (maybe it is not compiled " 1051 "into this binary)"); 1052 return -1; 1053 } 1054 1055 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1056 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1057 !netdev->u.nic.has_netdev) { 1058 peer = net_hub_add_port(0, NULL, NULL); 1059 } 1060 } 1061 1062 nc = qemu_find_netdev(netdev->id); 1063 if (nc) { 1064 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1065 return -1; 1066 } 1067 1068 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1069 /* FIXME drop when all init functions store an Error */ 1070 if (errp && !*errp) { 1071 error_setg(errp, "Device '%s' could not be initialized", 1072 NetClientDriver_str(netdev->type)); 1073 } 1074 return -1; 1075 } 1076 1077 if (is_netdev) { 1078 nc = qemu_find_netdev(netdev->id); 1079 assert(nc); 1080 nc->is_netdev = true; 1081 } 1082 1083 return 0; 1084 } 1085 1086 void show_netdevs(void) 1087 { 1088 int idx; 1089 const char *available_netdevs[] = { 1090 "socket", 1091 "hubport", 1092 "tap", 1093 #ifdef CONFIG_SLIRP 1094 "user", 1095 #endif 1096 #ifdef CONFIG_L2TPV3 1097 "l2tpv3", 1098 #endif 1099 #ifdef CONFIG_VDE 1100 "vde", 1101 #endif 1102 #ifdef CONFIG_NET_BRIDGE 1103 "bridge", 1104 #endif 1105 #ifdef CONFIG_NETMAP 1106 "netmap", 1107 #endif 1108 #ifdef CONFIG_POSIX 1109 "vhost-user", 1110 #endif 1111 #ifdef CONFIG_VHOST_VDPA 1112 "vhost-vdpa", 1113 #endif 1114 #ifdef CONFIG_VMNET 1115 "vmnet-host", 1116 "vmnet-shared", 1117 "vmnet-bridged", 1118 #endif 1119 }; 1120 1121 qemu_printf("Available netdev backend types:\n"); 1122 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1123 qemu_printf("%s\n", available_netdevs[idx]); 1124 } 1125 } 1126 1127 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1128 { 1129 gchar **substrings = NULL; 1130 Netdev *object = NULL; 1131 int ret = -1; 1132 Visitor *v = opts_visitor_new(opts); 1133 1134 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1135 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1136 1137 if (ip6_net) { 1138 char *prefix_addr; 1139 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1140 1141 substrings = g_strsplit(ip6_net, "/", 2); 1142 if (!substrings || !substrings[0]) { 1143 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1144 "a valid IPv6 prefix"); 1145 goto out; 1146 } 1147 1148 prefix_addr = substrings[0]; 1149 1150 /* Handle user-specified prefix length. */ 1151 if (substrings[1] && 1152 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1153 { 1154 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1155 "ipv6-prefixlen", "a number"); 1156 goto out; 1157 } 1158 1159 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1160 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1161 &error_abort); 1162 qemu_opt_unset(opts, "ipv6-net"); 1163 } 1164 1165 /* Create an ID for -net if the user did not specify one */ 1166 if (!is_netdev && !qemu_opts_id(opts)) { 1167 qemu_opts_set_id(opts, id_generate(ID_NET)); 1168 } 1169 1170 if (visit_type_Netdev(v, NULL, &object, errp)) { 1171 ret = net_client_init1(object, is_netdev, errp); 1172 } 1173 1174 qapi_free_Netdev(object); 1175 1176 out: 1177 g_strfreev(substrings); 1178 visit_free(v); 1179 return ret; 1180 } 1181 1182 void netdev_add(QemuOpts *opts, Error **errp) 1183 { 1184 net_client_init(opts, true, errp); 1185 } 1186 1187 void qmp_netdev_add(Netdev *netdev, Error **errp) 1188 { 1189 if (!id_wellformed(netdev->id)) { 1190 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1191 return; 1192 } 1193 1194 net_client_init1(netdev, true, errp); 1195 } 1196 1197 void qmp_netdev_del(const char *id, Error **errp) 1198 { 1199 NetClientState *nc; 1200 QemuOpts *opts; 1201 1202 nc = qemu_find_netdev(id); 1203 if (!nc) { 1204 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1205 "Device '%s' not found", id); 1206 return; 1207 } 1208 1209 if (!nc->is_netdev) { 1210 error_setg(errp, "Device '%s' is not a netdev", id); 1211 return; 1212 } 1213 1214 qemu_del_net_client(nc); 1215 1216 /* 1217 * Wart: we need to delete the QemuOpts associated with netdevs 1218 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1219 * HMP netdev_add. 1220 */ 1221 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1222 if (opts) { 1223 qemu_opts_del(opts); 1224 } 1225 } 1226 1227 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1228 { 1229 char *str; 1230 ObjectProperty *prop; 1231 ObjectPropertyIterator iter; 1232 Visitor *v; 1233 1234 /* generate info str */ 1235 object_property_iter_init(&iter, OBJECT(nf)); 1236 while ((prop = object_property_iter_next(&iter))) { 1237 if (!strcmp(prop->name, "type")) { 1238 continue; 1239 } 1240 v = string_output_visitor_new(false, &str); 1241 object_property_get(OBJECT(nf), prop->name, v, NULL); 1242 visit_complete(v, &str); 1243 visit_free(v); 1244 monitor_printf(mon, ",%s=%s", prop->name, str); 1245 g_free(str); 1246 } 1247 monitor_printf(mon, "\n"); 1248 } 1249 1250 void print_net_client(Monitor *mon, NetClientState *nc) 1251 { 1252 NetFilterState *nf; 1253 1254 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1255 nc->queue_index, 1256 NetClientDriver_str(nc->info->type), 1257 nc->info_str); 1258 if (!QTAILQ_EMPTY(&nc->filters)) { 1259 monitor_printf(mon, "filters:\n"); 1260 } 1261 QTAILQ_FOREACH(nf, &nc->filters, next) { 1262 monitor_printf(mon, " - %s: type=%s", 1263 object_get_canonical_path_component(OBJECT(nf)), 1264 object_get_typename(OBJECT(nf))); 1265 netfilter_print_info(mon, nf); 1266 } 1267 } 1268 1269 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1270 Error **errp) 1271 { 1272 NetClientState *nc; 1273 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1274 1275 QTAILQ_FOREACH(nc, &net_clients, next) { 1276 RxFilterInfo *info; 1277 1278 if (has_name && strcmp(nc->name, name) != 0) { 1279 continue; 1280 } 1281 1282 /* only query rx-filter information of NIC */ 1283 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1284 if (has_name) { 1285 error_setg(errp, "net client(%s) isn't a NIC", name); 1286 assert(!filter_list); 1287 return NULL; 1288 } 1289 continue; 1290 } 1291 1292 /* only query information on queue 0 since the info is per nic, 1293 * not per queue 1294 */ 1295 if (nc->queue_index != 0) 1296 continue; 1297 1298 if (nc->info->query_rx_filter) { 1299 info = nc->info->query_rx_filter(nc); 1300 QAPI_LIST_APPEND(tail, info); 1301 } else if (has_name) { 1302 error_setg(errp, "net client(%s) doesn't support" 1303 " rx-filter querying", name); 1304 assert(!filter_list); 1305 return NULL; 1306 } 1307 1308 if (has_name) { 1309 break; 1310 } 1311 } 1312 1313 if (filter_list == NULL && has_name) { 1314 error_setg(errp, "invalid net client name: %s", name); 1315 } 1316 1317 return filter_list; 1318 } 1319 1320 void hmp_info_network(Monitor *mon, const QDict *qdict) 1321 { 1322 NetClientState *nc, *peer; 1323 NetClientDriver type; 1324 1325 net_hub_info(mon); 1326 1327 QTAILQ_FOREACH(nc, &net_clients, next) { 1328 peer = nc->peer; 1329 type = nc->info->type; 1330 1331 /* Skip if already printed in hub info */ 1332 if (net_hub_id_for_client(nc, NULL) == 0) { 1333 continue; 1334 } 1335 1336 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1337 print_net_client(mon, nc); 1338 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1339 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1340 monitor_printf(mon, " \\ "); 1341 print_net_client(mon, peer); 1342 } 1343 } 1344 } 1345 1346 void colo_notify_filters_event(int event, Error **errp) 1347 { 1348 NetClientState *nc; 1349 NetFilterState *nf; 1350 NetFilterClass *nfc = NULL; 1351 Error *local_err = NULL; 1352 1353 QTAILQ_FOREACH(nc, &net_clients, next) { 1354 QTAILQ_FOREACH(nf, &nc->filters, next) { 1355 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1356 nfc->handle_event(nf, event, &local_err); 1357 if (local_err) { 1358 error_propagate(errp, local_err); 1359 return; 1360 } 1361 } 1362 } 1363 } 1364 1365 void qmp_set_link(const char *name, bool up, Error **errp) 1366 { 1367 NetClientState *ncs[MAX_QUEUE_NUM]; 1368 NetClientState *nc; 1369 int queues, i; 1370 1371 queues = qemu_find_net_clients_except(name, ncs, 1372 NET_CLIENT_DRIVER__MAX, 1373 MAX_QUEUE_NUM); 1374 1375 if (queues == 0) { 1376 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1377 "Device '%s' not found", name); 1378 return; 1379 } 1380 nc = ncs[0]; 1381 1382 for (i = 0; i < queues; i++) { 1383 ncs[i]->link_down = !up; 1384 } 1385 1386 if (nc->info->link_status_changed) { 1387 nc->info->link_status_changed(nc); 1388 } 1389 1390 if (nc->peer) { 1391 /* Change peer link only if the peer is NIC and then notify peer. 1392 * If the peer is a HUBPORT or a backend, we do not change the 1393 * link status. 1394 * 1395 * This behavior is compatible with qemu hubs where there could be 1396 * multiple clients that can still communicate with each other in 1397 * disconnected mode. For now maintain this compatibility. 1398 */ 1399 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1400 for (i = 0; i < queues; i++) { 1401 ncs[i]->peer->link_down = !up; 1402 } 1403 } 1404 if (nc->peer->info->link_status_changed) { 1405 nc->peer->info->link_status_changed(nc->peer); 1406 } 1407 } 1408 } 1409 1410 static void net_vm_change_state_handler(void *opaque, bool running, 1411 RunState state) 1412 { 1413 NetClientState *nc; 1414 NetClientState *tmp; 1415 1416 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1417 if (running) { 1418 /* Flush queued packets and wake up backends. */ 1419 if (nc->peer && qemu_can_send_packet(nc)) { 1420 qemu_flush_queued_packets(nc->peer); 1421 } 1422 } else { 1423 /* Complete all queued packets, to guarantee we don't modify 1424 * state later when VM is not running. 1425 */ 1426 qemu_flush_or_purge_queued_packets(nc, true); 1427 } 1428 } 1429 } 1430 1431 void net_cleanup(void) 1432 { 1433 NetClientState *nc; 1434 1435 /*cleanup colo compare module for COLO*/ 1436 colo_compare_cleanup(); 1437 1438 /* We may del multiple entries during qemu_del_net_client(), 1439 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1440 */ 1441 while (!QTAILQ_EMPTY(&net_clients)) { 1442 nc = QTAILQ_FIRST(&net_clients); 1443 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1444 qemu_del_nic(qemu_get_nic(nc)); 1445 } else { 1446 qemu_del_net_client(nc); 1447 } 1448 } 1449 1450 qemu_del_vm_change_state_handler(net_change_state_entry); 1451 } 1452 1453 void net_check_clients(void) 1454 { 1455 NetClientState *nc; 1456 int i; 1457 1458 net_hub_check_clients(); 1459 1460 QTAILQ_FOREACH(nc, &net_clients, next) { 1461 if (!nc->peer) { 1462 warn_report("%s %s has no peer", 1463 nc->info->type == NET_CLIENT_DRIVER_NIC 1464 ? "nic" : "netdev", 1465 nc->name); 1466 } 1467 } 1468 1469 /* Check that all NICs requested via -net nic actually got created. 1470 * NICs created via -device don't need to be checked here because 1471 * they are always instantiated. 1472 */ 1473 for (i = 0; i < MAX_NICS; i++) { 1474 NICInfo *nd = &nd_table[i]; 1475 if (nd->used && !nd->instantiated) { 1476 warn_report("requested NIC (%s, model %s) " 1477 "was not created (not supported by this machine?)", 1478 nd->name ? nd->name : "anonymous", 1479 nd->model ? nd->model : "unspecified"); 1480 } 1481 } 1482 } 1483 1484 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1485 { 1486 return net_client_init(opts, false, errp); 1487 } 1488 1489 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1490 { 1491 const char *type = qemu_opt_get(opts, "type"); 1492 1493 if (type && is_help_option(type)) { 1494 show_netdevs(); 1495 exit(0); 1496 } 1497 return net_client_init(opts, true, errp); 1498 } 1499 1500 /* For the convenience "--nic" parameter */ 1501 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1502 { 1503 char *mac, *nd_id; 1504 int idx, ret; 1505 NICInfo *ni; 1506 const char *type; 1507 1508 type = qemu_opt_get(opts, "type"); 1509 if (type && g_str_equal(type, "none")) { 1510 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1511 } 1512 1513 idx = nic_get_free_idx(); 1514 if (idx == -1 || nb_nics >= MAX_NICS) { 1515 error_setg(errp, "no more on-board/default NIC slots available"); 1516 return -1; 1517 } 1518 1519 if (!type) { 1520 qemu_opt_set(opts, "type", "user", &error_abort); 1521 } 1522 1523 ni = &nd_table[idx]; 1524 memset(ni, 0, sizeof(*ni)); 1525 ni->model = qemu_opt_get_del(opts, "model"); 1526 1527 /* Create an ID if the user did not specify one */ 1528 nd_id = g_strdup(qemu_opts_id(opts)); 1529 if (!nd_id) { 1530 nd_id = id_generate(ID_NET); 1531 qemu_opts_set_id(opts, nd_id); 1532 } 1533 1534 /* Handle MAC address */ 1535 mac = qemu_opt_get_del(opts, "mac"); 1536 if (mac) { 1537 ret = net_parse_macaddr(ni->macaddr.a, mac); 1538 g_free(mac); 1539 if (ret) { 1540 error_setg(errp, "invalid syntax for ethernet address"); 1541 goto out; 1542 } 1543 if (is_multicast_ether_addr(ni->macaddr.a)) { 1544 error_setg(errp, "NIC cannot have multicast MAC address"); 1545 ret = -1; 1546 goto out; 1547 } 1548 } 1549 qemu_macaddr_default_if_unset(&ni->macaddr); 1550 1551 ret = net_client_init(opts, true, errp); 1552 if (ret == 0) { 1553 ni->netdev = qemu_find_netdev(nd_id); 1554 ni->used = true; 1555 nb_nics++; 1556 } 1557 1558 out: 1559 g_free(nd_id); 1560 return ret; 1561 } 1562 1563 int net_init_clients(Error **errp) 1564 { 1565 net_change_state_entry = 1566 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1567 1568 QTAILQ_INIT(&net_clients); 1569 1570 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1571 net_init_netdev, NULL, errp)) { 1572 return -1; 1573 } 1574 1575 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) { 1576 return -1; 1577 } 1578 1579 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) { 1580 return -1; 1581 } 1582 1583 return 0; 1584 } 1585 1586 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1587 { 1588 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1589 return -1; 1590 } 1591 1592 return 0; 1593 } 1594 1595 /* From FreeBSD */ 1596 /* XXX: optimize */ 1597 uint32_t net_crc32(const uint8_t *p, int len) 1598 { 1599 uint32_t crc; 1600 int carry, i, j; 1601 uint8_t b; 1602 1603 crc = 0xffffffff; 1604 for (i = 0; i < len; i++) { 1605 b = *p++; 1606 for (j = 0; j < 8; j++) { 1607 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1608 crc <<= 1; 1609 b >>= 1; 1610 if (carry) { 1611 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1612 } 1613 } 1614 } 1615 1616 return crc; 1617 } 1618 1619 uint32_t net_crc32_le(const uint8_t *p, int len) 1620 { 1621 uint32_t crc; 1622 int carry, i, j; 1623 uint8_t b; 1624 1625 crc = 0xffffffff; 1626 for (i = 0; i < len; i++) { 1627 b = *p++; 1628 for (j = 0; j < 8; j++) { 1629 carry = (crc & 0x1) ^ (b & 0x01); 1630 crc >>= 1; 1631 b >>= 1; 1632 if (carry) { 1633 crc ^= POLYNOMIAL_LE; 1634 } 1635 } 1636 } 1637 1638 return crc; 1639 } 1640 1641 QemuOptsList qemu_netdev_opts = { 1642 .name = "netdev", 1643 .implied_opt_name = "type", 1644 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1645 .desc = { 1646 /* 1647 * no elements => accept any params 1648 * validation will happen later 1649 */ 1650 { /* end of list */ } 1651 }, 1652 }; 1653 1654 QemuOptsList qemu_nic_opts = { 1655 .name = "nic", 1656 .implied_opt_name = "type", 1657 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1658 .desc = { 1659 /* 1660 * no elements => accept any params 1661 * validation will happen later 1662 */ 1663 { /* end of list */ } 1664 }, 1665 }; 1666 1667 QemuOptsList qemu_net_opts = { 1668 .name = "net", 1669 .implied_opt_name = "type", 1670 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1671 .desc = { 1672 /* 1673 * no elements => accept any params 1674 * validation will happen later 1675 */ 1676 { /* end of list */ } 1677 }, 1678 }; 1679 1680 void net_socket_rs_init(SocketReadState *rs, 1681 SocketReadStateFinalize *finalize, 1682 bool vnet_hdr) 1683 { 1684 rs->state = 0; 1685 rs->vnet_hdr = vnet_hdr; 1686 rs->index = 0; 1687 rs->packet_len = 0; 1688 rs->vnet_hdr_len = 0; 1689 memset(rs->buf, 0, sizeof(rs->buf)); 1690 rs->finalize = finalize; 1691 } 1692 1693 /* 1694 * Returns 1695 * 0: success 1696 * -1: error occurs 1697 */ 1698 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1699 { 1700 unsigned int l; 1701 1702 while (size > 0) { 1703 /* Reassemble a packet from the network. 1704 * 0 = getting length. 1705 * 1 = getting vnet header length. 1706 * 2 = getting data. 1707 */ 1708 switch (rs->state) { 1709 case 0: 1710 l = 4 - rs->index; 1711 if (l > size) { 1712 l = size; 1713 } 1714 memcpy(rs->buf + rs->index, buf, l); 1715 buf += l; 1716 size -= l; 1717 rs->index += l; 1718 if (rs->index == 4) { 1719 /* got length */ 1720 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1721 rs->index = 0; 1722 if (rs->vnet_hdr) { 1723 rs->state = 1; 1724 } else { 1725 rs->state = 2; 1726 rs->vnet_hdr_len = 0; 1727 } 1728 } 1729 break; 1730 case 1: 1731 l = 4 - rs->index; 1732 if (l > size) { 1733 l = size; 1734 } 1735 memcpy(rs->buf + rs->index, buf, l); 1736 buf += l; 1737 size -= l; 1738 rs->index += l; 1739 if (rs->index == 4) { 1740 /* got vnet header length */ 1741 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1742 rs->index = 0; 1743 rs->state = 2; 1744 } 1745 break; 1746 case 2: 1747 l = rs->packet_len - rs->index; 1748 if (l > size) { 1749 l = size; 1750 } 1751 if (rs->index + l <= sizeof(rs->buf)) { 1752 memcpy(rs->buf + rs->index, buf, l); 1753 } else { 1754 fprintf(stderr, "serious error: oversized packet received," 1755 "connection terminated.\n"); 1756 rs->index = rs->state = 0; 1757 return -1; 1758 } 1759 1760 rs->index += l; 1761 buf += l; 1762 size -= l; 1763 if (rs->index >= rs->packet_len) { 1764 rs->index = 0; 1765 rs->state = 0; 1766 assert(rs->finalize); 1767 rs->finalize(rs); 1768 } 1769 break; 1770 } 1771 } 1772 1773 assert(size == 0); 1774 return 0; 1775 } 1776